I also get mopey when I bust my butt to make a particularly cogent and detailed journal entry (with illustrations) and then get zero comments on it. Bummer ... I wish I was more thick-skinned about this stuff.
Of course, once this all starts percolating around in my head I get into that whole self-loathing thing about being such a wuss that this stuff bugs me, and being such a twit that I bother with being anything other than an L.J. voyeur in the first place.
Damn ... I need some coffee!